A rainbow is a result of:
a. the Huygens Effect.
c. dispersion.
b. different color droplets of water.
d. interference.
C
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Viscosity definition
What will be an ideal response?
Star A and star B both have an apparent magnitude of 7.0, but star A is at a distance of 15 pc and star B is at a distance of 30 pc. Which statement below is correct?
A) Star A appears brighter than star B, but star B and star A have the same intrinsic brightness. B) Star B appears brighter than star A, but star B and star A have the same intrinsic brightness. C) Star A and star B appear to have the same brightness, but star B is intrinsically brighter than star A. D) Star A and star B appear to have the same brightness, but star A is intrinsically brighter than star B. E) It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.
Three 2.50-?C charges are placed on tiny conducting spheres at the ends of 1.00 m-long strings that are connected at 120° angles as shown below. The magnitude, in N, of the force on any one of the charges is
?
?
a.
1.88 × 10?2.
b.
3.25 × 10?2.
c.
3.73 × 10?2.
d.
6.50 × 10?2.
e.
7.50 × 10?2.
A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s2 . What is its angular speed at the instant it goes through an angular displacement of 7.00 rad?
a. 280 rad/s b. 0.175 rad/s c. 0.592 rad/s d. 880 rad/s